UC3842BN1 Просмотр технического описания (PDF) - ON Semiconductor

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UC3842BN1

High Performance Current Mode Controllers

ON Semiconductor 

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV

ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 8], RT = 10 k, CT = 3.3 nF, for typical values TA = 25°C, for min/max values

TA is the operating ambient temperature range that applies [Note 9], unless otherwise noted.)

UC284XB

UC384XB, BV

Characteristics

Symbol

Min Typ Max Min

Typ Max Unit

PWM SECTION

Duty Cycle

Maximum (UC284XB, UC384XB)

Maximum (UC384XBV)

Minimum

%

DC(max)

94

96

–

94

96

–

–

–

–

93

96

–

DC(min)

–

–

0

–

–

0

TOTAL DEVICE

Power Supply Current

Startup (VCC = 6.5 V for UCX843B,

Startup (VCC 14 V for UCX842B, BV)

Operating (Note 8)

ICC + IC

mA

–

0.3

0.5

–

0.3

0.5

–

12

17

–

12

17

Power Supply Zener Voltage (ICC = 25 mA)

VZ

30

36

–

30

36

–

V

8. Adjust VCC above the Startup threshold before setting to 15 V.

9. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

Tlow = 0°C for UC3842B, UC3843B; –25°C for UC2842B, UC2843B; –40°C for UC3842BV, UC3843BV

Thigh = +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B; +105°C for UC3842BV, UC3843BV

NCV3843BV: Tlow = –40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and

change control.

80

50

20

8.0

5.0

2.0 VCC = 15 V

TA = 25°C

0.8

10 k

20 k

50 k 100 k 200 k

500 k

fOSC, OSCILLATOR FREQUENCY (kHz)

1.0 M

Figure 2. Timing Resistor

versus Oscillator Frequency

9.0

VCC = 15 V

VOSC = 2.0 V

8.5

8.0

7.5

7.0

-Ă55 -Ă25 0

25

50

75 100 125

TA, AMBIENT TEMPERATURE (°C)

Figure 4. Oscillator Discharge Current

versus Temperature

100

1. CT = 10 nF

50 2. CT = 5.0 nF

3. CT = 2.0 nF

4. CT = 1.0 nF

20 5. CT = 500 pF

6. CT = 200 pF

10 7. CT = 100 pF

5.0

4

3

2

1

7

6

5

2.0

1.0

10 k

VCC = 15 V

TA = 25°C

20 k

50 k 100 k 200 k

500 k

fOSC, OSCILLATOR FREQUENCY (kHz)

1.0 M

Figure 3. Output Deadtime

versus Oscillator Frequency

100

90

80

Idischg = 7.5 mA

70

60

Idischg = 8.8 mA

VCC = 15 V

CT = 3.3 nF

50

TA = 25°C

40

0.8 1.0

2.0

3.0 4.0 5.0 6.0 7.0 8.0

RT, TIMING RESISTOR (kΩ)

Figure 5. Maximum Output Duty Cycle

versus Timing Resistor

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